function iir_lowpass(const zpk &, double, double) iir¶

zpk iir_lowpass(const zpk& filter, double frequency, double fs = 2.0)

Calculates zero-pole-gain coefficients for the low-pass IIR filter

Parameters

filter	Filter type: chebyshev1, chebyshev2, bessel, butterworth
frequency	Cutoff frequency (Hz)
fs	Sampling frequency (Hz)

Returns

The resulting zpk filter